rbgs

So i've been recently doing a lot of rbgs lately, and usually i see destro, but that's pretty obvious why. But now im starting to see more affliction and demo locks. why?! Isn't destro more superior? Affliction i can see, why for mass pressure on the whole team, but demo? That doesn't really make sense.

Demo has insane AoE, an extra MS and on-demand survivability. I still prefer destro because destro handles 1v1 situations way better, but demo is still good in rbgs and a solid demo lock can inflict some serious pain.

MS = Mortal Strike, healing debuff from the Felguard if I'm not mistaken.

-in 5 man dungeons, Arms Warriors again are the weakest link in the chain as they require 3X amount of healing as other classes and therefore die much more frequently and receive less healing in general, as with the amount of mana spent to keep an Arms Warrior alive the healer can heal all other members and himself.

Demo has insane AoE, an extra MS and on-demand survivability. I still prefer destro because destro handles 1v1 situations way better, but demo is still good in rbgs and a solid demo lock can inflict some serious pain.

Destro is the worst among our specs to handle 1v1 issues.The only spec that requires you to cast. And this is impossible against a warrior/rogue/druid/dk/hunter etc.
Destro isn't even close to demonology's utility,arena or rbg wise.

To answer OP's question. Demo > Destro in :

Utility (more cc,debuffs,knockback)

Survivability (2xTeleport on different cds,knockback again,1 more escape mechanic on low cd(Demonic Leap),better synergy with Sacrifictial Pact talent,1 tank glyph that helps on objectives too(other than being a defensive kit it helps you grab a flag or get ORB if needed)

On demand damage(especially AOE) : Destro is the less viable solution to bring the on demand burst,in a meaning Chaos Bolt is easy preventable.This means you can do 0 dmg during your cds versus a team with average inteligence.On the other hand,Demo speccing into for example GoServ can bring 2 empowered felguards and 1 chaos wave before chain CC'd on CDs.Any dmg still > than 0 dmg.

I could bring other issues too,but these are why i prefer demo over destro.